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BMW 3-Series (E90 E92) Forum
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BMW N54 AccessPORT Beta Race Fuel and E-30 Maps
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08-31-2012, 12:44 PM | #68 | |
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08-31-2012, 12:46 PM | #69 | |
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And the articles for which I provided links explain why this is the case. Neil |
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08-31-2012, 01:43 PM | #71 |
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no shit look at the timing table
versus Stage 2plus
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08-31-2012, 01:46 PM | #72 |
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08-31-2012, 04:35 PM | #73 |
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whoa, that's an aggressive mid-range timing bump, more aggressive than the OE timing curve even
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08-31-2012, 07:06 PM | #75 | |
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Lol, Whatever, I'll take Wikipedia over some MIT engineering papers. Wiki has way more pictures in it! It's painful to read some of the things posted on here when a more through search then a wiki search provides volumes of data. Thank you for taking the time to post some real data. I kinda gave up on it a while ago. |
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08-31-2012, 07:13 PM | #76 |
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So all my logs so far have look clean as hell! Only one log had a one cylinder with a slight timing correction. But when I logged a 2nd-3rd gear log the car seemed to have 4 different timing corrections as soon as I got into 3rd gear and then the corrections slowly disappear as the rpms raise? Is this bad?
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08-31-2012, 07:41 PM | #77 |
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If I put 10 gallons of 91 octane, how many gallons of E85 do I need to put for this map? It didn't say it supported 91 octane, only 93.
I'm doing a custom tune anyway but just wondering... |
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08-31-2012, 07:46 PM | #78 | |
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08-31-2012, 07:50 PM | #79 |
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How is there 4 pages on this post and nobody has asked if these new maps are called "Corn on the COBB"???
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08-31-2012, 07:51 PM | #80 |
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about 5 gallons...There is an equation on page 3 I believe
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09-01-2012, 07:58 AM | #82 | ||
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Read those articles carefully! They are talking about pure ethanol, not E85. Like I said before, there is a big difference between pure ethanol and E85 fuels! They ARE NOT the same. From your MIT PDFs: Quote:
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09-01-2012, 08:40 AM | #83 |
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IMHO, given the variances of "E85" from pump to pump, you should run at least 7 gallons of E70-E85 to 9 gallons of 91-93 octane (with or without 10% ethanol content) which should give you anywhere from 30-43% ethanol content, more than what our stock fuel system has been able to handle, even without a re-flashed fuel table.
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Prior Car:'14 Audi S5 3.0t DSG [ APR ECU/TCU | Pullies + basic bolt-on mods | 10.861@127.90mph ] Current Car: F82 M4cs | TT-RS | On Order: i4 M50 |
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09-01-2012, 08:41 AM | #84 |
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This is correct to a point. The DME will pull ignition timing when needed, but during part-throttle situation's, I would imaging running this aggressive map to drive home, would be more than safe. But why would anyone have COBB and not keep other maps loaded in the AP in the car to prevent this scenario in the first place ? Plus anyone who drives flat out in this map with just 91-93 octane and having then complaining about engine performance shouldn't be modifying cars in the first place.
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Prior Car:'14 Audi S5 3.0t DSG [ APR ECU/TCU | Pullies + basic bolt-on mods | 10.861@127.90mph ] Current Car: F82 M4cs | TT-RS | On Order: i4 M50 |
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09-01-2012, 10:20 AM | #86 | |||
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Those MIT articles indicate that in a direct injection application the effective octane of pure Ethanol (R+M/2) is 160. That is a pretty big difference from the 99 you cite from Wikipedia but don't forget though that according to the standards used those values were NOT determined for a direct injection configuration. For example ASTM standard D2700 - 12 (for measuring MON) as well as ASTM D2699 - 12 (for measuring RON) calls for a carbureted engine to be used in the testing! From that same MIT article, Quote:
Ford claims that even just direct injecting E85 as a supplement to regular gas port injection can raise the effective octane to over 150. The numbers are probably a little optimistic given this is a new technology they are trying to develop but it is good information none the less... http://news.pickuptrucks.com/2009/06...el-engine.html So if we assume that, 1) The gasoline the ethanol is blended with is 87 octane 2) We can ignore that the gas will see an increase in effective octane from DI 3) We are getting the lowest allowed concentration of ethanol in E85 (68% per the DoE Handbook for Handling, Storing, and Dispensing E85) Then using MIT's numbers, in a DI setup, we should still get an effective octane of about 136. So perhaps the difference between E85 and E100 is not as great as you think.
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09-01-2012, 11:07 AM | #87 | |
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You can test it with a simple graduated test tube that costs 5 bucks. I'm not saying there isn't a "bad batch" out there somewhere it's just that it's not nearly as bad as some may lead you to believe. The standards for E85 do allow some variance that changes from state to state. Here in Washington state it has to be between 85-75% or it's illegal to sell. However like I said I have yet to see it below 82%. http://agr.wa.gov/bioenergy/docs/E85...Guidelines.pdf |
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09-01-2012, 11:16 AM | #88 |
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If you ignore all the data and just look at the real word results, do you think COBB would get a 40+hp delta by adding an .3 in effective octane or close to 80+hp running straight E85? (using Procede FBO car 380rwhp VS. Procede Flexfuel set up 453rwhp as the example) Clearly there is more to it.
Last edited by Myaddiction; 09-01-2012 at 11:27 AM.. Reason: to clarify |
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